Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda139292bd01058…

MALICIOUS

PDF

88.7 KB Created: 2021-09-03 13:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cbe54ddc78b7ee9de4c486afbba58d9e SHA-1: 2a0d241ba66b8aba956310149356439e2800cf94 SHA-256: fda139292bd0105898bb97aceaae1eb01e76f931e148a4f26c4cd3c9468b1630
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised WordPress sites and other potentially disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious or deceptive content, likely for phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://klick-tipp.at/ckfinder/userfiles/publics/files/silakibap.pdf In PDF document text
    • http://anthonyvienna.com/sites/default/files/file/39189368961.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dee9366e12---zefikuv.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/75271139219.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/rexewozujinajotefogaj.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/72198674019.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///79183138385.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21a7c83364---futuwoxudokanapog.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/58076339624.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vovotagalerededa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607972f36b424---luzejofamejum.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c6476ef7c1361aef00ce58d9664fb739/mibegilifanew.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16103c44da96c4---lagig.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d2298e28---18681186679.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/17244257291.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/goxamed.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/diwalowitowuteleduwe.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/21941612057.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/814aebb9aa932bafc50259dd14664a85/xabim.pdfIn PDF document text
    • https://soltendance.com/stockages/files/suzinuzosikilisusatazagez.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/xemalarulalixavumijela.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32feb7bca1---72316551783.pdfIn PDF document text
    • http://effektfilm.de/files/file/43209293333.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/55797199341.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/tilizaputopew.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fae467b796---17394464722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=journal+writing+for+elementary+students+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 17760 bytes
SHA-256: 1ff01b113f20c67f7e0f73ec1c5290881d76c9db238e59d605ede9f048ef1ca6
font_01_sfnt_off000122ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AD 11132 bytes
SHA-256: 6c63fcfe8a154557bc1c096e8ca7fb465d02a4140bd6ffd384bdeea4f6b43afb
font_02_sfnt_off00013c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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